Delete unused BluetoothAudioSink code.

device/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
@@ skipping 164 matching lines @@
       "//chromeos:test_support_without_gmock",
     ]
   }
 
   if ((is_chromeos || is_linux) && use_dbus) {
     configs += [ "//build/config/linux/dbus" ]
 
     sources += [
       "bluetooth/bluez/bluetooth_adapter_profile_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_advertisement_bluez_unittest.cc",
-      "bluetooth/bluez/bluetooth_audio_sink_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_gatt_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_service_attribute_value_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_service_record_bluez_unittest.cc",
       "bluetooth/bluez/bluetooth_socket_bluez_unittest.cc",
       "bluetooth/dbus/bluetooth_gatt_application_service_provider_unittest.cc",
       "bluetooth/test/bluetooth_test_bluez.cc",
       "bluetooth/test/bluetooth_test_bluez.h",
     ]
 
@@ skipping 78 matching lines @@
     ]
     srcjar_deps = [ "//device/gamepad:java_enums_srcjar" ]
   }
 
   java_cpp_enum("bluetooth_test_javagen") {
     sources = [
       "bluetooth/test/bluetooth_test.h",
     ]
   }
 }